First Hirsute Hippo test rebuild (and GCC related test rebuilds)

[Matthias Klose]

The first test rebuild of Hirsute Hippo was started on December 20 2020 for
all architectures, all components. The rebuild is almost finished.
It is still running for the multiverse component on some architectures.

Thanks to everybody keeping the buildds going during the end-of-year break.

Results (please also look at the superseded builds) can be found at

https://people.canonical.com/~doko/ftbfs-report/test-rebuild-20201216-hirsute-hirsute.html

Additional build failures for packages in hirsute-proposed (not yet in hirsute)
can be found at http://qa.ubuntuwire.com/ftbfs/

Please help fixing the build failures.

Another test rebuild using GCC 11 can be found at
https://people.canonical.com/~doko/ftbfs-report/test-rebuild-20201216-hirsute-gcc11-hirsute.html
Still running on arm64, armhf, ppc64el.  That's in preparation for GCC 11 for
the 21.10 release.  GCC test packages can be found in
https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/volatile/+packages

Yet another test build turning on link time optimizations by default is at
https://people.canonical.com/~doko/ftbfs-report/test-rebuild-20201216-hirsute-lto-hirsute.html
This is only done for the 64bit architectures amd64, arm64, ppc64el and s390x.
The optimizations are turned on by the dpkg package available in
https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/dpkg-lto/+packages


Happy New Year and bug fixing, Matthias